Electronic Energy Levels and Band Alignment for Aqueous Phenol and Phenolate from First Principles.

Electronic Energy Levels and Band Alignment for Aqueous Phenol and Phenolate from First Principles.
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从第一原理得出水性苯酚和酚盐的电子能级和能带排列

DOI:
10.1021/acs.jpcb.5b04189
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发表时间:
2015
期刊:
The journal of physical chemistry. B
影响因子:
--
通讯作者:
G. Galli
G. Galli
中科院分区:
--
文献类型:
--
作者:
D. Opalka;T. A. Pham;M. Sprik;G. Galli

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用密度泛函理论和多体微扰理论计算了苯酚和酚酸盐溶液中的电子能级。基于计算标准氢电极的概念,溶剂的价带和导带以及溶质的电离能与真空水平对齐。我们发现广义梯度近似、HSE混合泛函计算和g0w0近似中的多体微扰理论之间存在显著的定量差异。对于苯酚,在溶液的Kohn-Sham特征值谱中分配了两个低于散装水的光离阈值的电离能。发现脱质子生成酚酸盐使溶剂的价带最大值以上的第三个已占据能级上升,其特征是羟基上有一个电子孤对。发现酚酸盐的第二和第三电离能非常相似,并解释了最近用液体微射流光发射光谱实验观察到的强度模式。
Electronic energy levels in phenol and phenolate solutions have been computed using density functional theory and many-body perturbation theory. The valence and conduction bands of the solvent and the ionization energies of the solutes have been aligned with respect to the vacuum level based on the concept of a computational standard hydrogen electrode. We have found significant quantitative differences between the generalized-gradient approximation, calculations with the HSE hybrid functional, and many-body perturbation theory in the G0W0approximation. For phenol, two ionization energies below the photoionization threshold of bulk water have been assigned in the spectrum of Kohn–Sham eigenvalues of the solution. Deprotonation to phenolate was found to lift a third occupied energy level above the valence band maximum of the solvent which is characterized by an electronic lone pair at the hydroxyl group. The second and third ionization energies of phenolate were found to be very similar and explain the intensity pattern observed in recent experiments using liquid-microjet photoemission spectroscopy.
DOI: 10.1063/1.4887259
发表时间: 2014-07
期刊: The Journal of chemical physics
影响因子: --
作者:
Daniel Opalka;T. Pham;M. Sprik;G. Galli
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